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US 3,944,688 AGranted
Method for the manufacture of water-repellent, fire-resistant nonwoven fabrics
AssigneePennwalt Corporation
InventorCharles Edward Inman
Life of this patent
Estimating the term…
Abstract
A fire-resistant, water- and oil-repellent nonwoven fabric is prepared using a fire-retardant, surfactant-free adhesive/binder containing halogen and/or phosphorus additive, followed by treatment with a fluorochemical repellent agent.
Claims6
A process for preparing an oil and water-repellent, fire retardant, nonwoven fabric which comprises the steps of:
- (A) providing a dry nonwoven fabric of fibers bound together by about 5 to 50%, based on dry weight of the nonwoven fabric, of surfactant-free adhesive solid selected from the class consisting of vinyl acetate and alkyl acrylate aqueous dispersion polymers, containing in admixture therewith from about 25 to 110%, based on the weight of the polymer, of a flame retardant agent selected from the group consisting of halogen, phosphorus and halogen and phosphorus containing flame retardants;
- (B) treating the fabric with an aqueous bath containing in admixture a fluorochemical oil and water-repellent composition in an amount sufficient to deposit on the fabric from about 0.05 to 0.8% solids by weight thereof, based on the dry fabric weight, and drying the fabric.
Dependencies are inferred from the claim text.